How to use isotopic in a sentence

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Sentence Examples Ecologists see these isotopic ratios of carbon, hydrogen, oxygen, and nitrogen as signatures. The plan is that these will determine the abundance and stable isotopic compositions of elements such as hydrogen, carbon, nitrogen and oxygen. Based on changes in isotopic composition, individual amino acids could be roughly divided into three groups. To understand isotopic variation in Florida sirenians, we selected four teeth for serial sampling. To exclude the possibility of phaeochromocytoma, case 1 underwent computed tomography and cases 3 and 4 underwent isotopic imaging. It then addresses the processes and geochemical conditions at the time of deposition that controlled the observed isotopic signal. The timing of the deformation is critical to each of these models but so far isotopic ages and biostratigraphic evidence have been equivocal. This points to a minor influence of diagenetic carbonate on the isotopic signal. This isotopic shift is supported by the presence of Musgrave-derived boulders within the tillites that are associated with the rhythmites. When the gas was analyzed it was found to have isotopic ratios identical to those found in the Martian atmosphere. Measuring the isotopic ratios on Mars will provide clues about possible biological activity. The combined isotopic data suggest derivation of the sediments from at least three distinct crustal source regions. So far, only few biostratigraphically well-constrained isotopic ages constitute the geochronological framework of the Devonian period. Other examples of relative isotopic dating are the deuterium variations in ice cores and the osmium isotope record of marine sediments. Radiocarbon dating relies on the fact that carbon exists naturally in several isotopic forms. During subsequent logging, samples of core were selected for sectioning and for geochemical, mineralogical and isotopic analysis. To compare the deuterium contents of the different peptides, an averaged mass was obtained by centroiding the envelope of isotopic peaks. Most major extinction events are associated with pronounced isotopic excursions. Only the most robust biominerals survive into the fossil record, and the range of isotopic systems available to study is limited. Our isotopic results indicate that the dated synkinematic anatectic granites are Caledonian rather than Grenvillian in age. Show More Sentences Glycine and valine exhibited isotopic values outside the range of our sampled end members. In Scladina cave, oscillations between glacial and more temperate episodes have been demonstrated by microfaunal, palinological, and isotopic data. As diagenetic growth of authigenic apatite continues within a bone, the isotopic composition of the whole bone will trend towards a purely diagenetic signal. Some structural, petrological and isotopic evidence suggests multi-stage and possibly polycyclic metamorphic evolution of the granulites of the Eastern Ghats belt. Likewise, isotopically substituted lipid membranes can be differentiated from protein adlayers and even each other with the proper selection of unique isotopic labels. With the potentiometric method, no CA activity could be measured, whereas with the isotopic disequilibrium technique, significant CA activity could be detected. Finally, a U-Pb isotopic study of zircon and monazite from khondalite and sapphirine granulite was undertaken as a more reliable method for dating the metamorphic event. In Figure 2 we describe the specific field relations of the granulites and granitoids, to outline the task of sample selection for our isotopic study. The isotopic composition of these recrystallized bones is therefore a mixture between two endmember compositions, one biogenic and one diagenetic. Natural and isotopic tracers are used in order to help identify the dominant processes generating runoff, on various spatial scales. Industrial processes used to distill crude oil likewise leave a distinct chemical and isotopic signature on the manufactured compounds. As soon as this form is modified, the masses and isotopic composition can be revealed. The relative constancy of the isotopic abundances makes it possible to tabulate meaningful average atomic masses for the elements. They found that the isotopic composition was similar to that of loggerhead scute. Study the effects of various materials as well as isotopic and orthotropic factors. We need a microgram of uranium in order to be able to do that isotopic analysis, but we don't need much bone to do that. Nonetheless, under certain circumstances, nonrandom isotopic effects can become appreciable. The triple point temperatures in the two types of cell typically differed by 100 µK due to the different isotopic compositions. The isotopic data do not conform to a simple mixing equation. A small number of laboratories applied corrections for the isotopic composition of their water, but most of them did not. Show More Sentences Measuring equipment is installed at various points to check the isotopic composition of the streams. Subsequently, one lab was given hair samples on which to do an isotopic assay because of low total uranium concentrations. Most of the calcites examined from fracture fillings do not exhibit isotopic equilibrium with the recent formation waters. Prior to shipment, a measurement for confirming the conservatism of the isotopic composition shall be made. Petrographic and isotopic investigations will be ongoing in an effort to establish the source of the fluids and hence, a genetic model. Natural variations in isotopic composition should be considered, as well as those of major and minor dissolved constituents. Partial melting models, isotopic studies and the petrology of entrained ultramafic xenoliths suggest that many basanitic magmas are sourced in the asthenosphere. In these cases, associated fluids could have modified the original isotopic signature, in particular when anhydrite was altered to secondary gypsum by surface waters. Trace element data and isotopic analysis demonstrate that the arc is composed of islandarc tholeiite and ocean-island basalts and calc-alkaline arc-type extrusive rocks. The development of isotopic tracers during the war was a by-product of the preparation of radioactive and stable isotopes in connection with work on the atomic bomb. Detailed elemental and isotopic studies of this crystal fractionation pathway have indicated the importance of mafic phases, notably calcic clinopyroxene and biotite. The isotopic signature is changed, too, by the centrifuges used to separate 235U from 238U during the process of enrichment, and radioactive decay after processing creates yet further elements that can be detected this way. The relative safeguards significance of these materials depends on their physical form, chemical and isotopic composition, concentration and their status as fresh or irradiated material. The note refers to water of a specific isotopic composition. New differential isotopic measurements for silicon tetrafluoride demonstrated and confirmed that the IRMM molar mass measurements on the Japanese Shin-Etsu material were, without doubt, measurements of the highest quality. The authors explore the isotopic orientation of these constituents and provide detailed information on the evolution of these structures as the sea ice evolves seasonally. Chapter topics include orogenesis, paleogeography, climate modeling, sedimentation, biodiversity, and isotopic excursions. Multiple regression models coupled with a bootstrap verification procedure were applied to isotopic data to reconstruct targeted hydro-climatic variables over the last 200 years. Merck offers a wide range of deuterated solvents with extremely low residual water, excellent chemical purity and the highest isotopic enrichment available. Non-radiological effects from tritium such as transmutation and isotopic effects are likely, but if they do occur, it would not be possible to distinguish their effects from those of radiation. Show More Sentences For many years, IAEA had been working to develop isotopic and nuclear techniques to help member States improve food security and achieve sustainable agricultural production in such areas as soil science and pest control. A team of astronomers, led by a scientist from Paris Observatory, puts back into question all isotopic measurements involving 6Li and 7Li up to now, since the asymmetry of the lithium lines has not been taken into account. The analyses highlighted that the isotopic compositions of quartz and kyanite in the Knauern are comparable with those of the surrounding metapelites. Calcium isotopic variations produced by biological, kinetic, radiogenic and nucleosynthetic processes. In addition to studying the latitudinal spreading of trace consituents such as HCN and CS through the Jovian stratosphere, attempts to determine the C, N, and S isotopic abundances are a focus of recent work. It is a highly-specialized and particularly large adaptation of a conventional ion microprobe, designed for the micro-scale isotopic analysis of solids. The isotopic composition of the plutonium is measured by gamma ray spectrometry, using specialized equipment that bars inspectors from any of the measurement information other than the final ratio. A key goal of the project is to develop exploration criteria using mineralogical, geochemical and isotopic variations within attendant alteration haloes to identify the presence and nature of undiscovered, deep ore bodies. Tony's research has primarily been on Proterozoic volcanism, plutonism, and tectonics in Nunavut, and has involved field mapping and geochemical techniques, including regional isotopic surveys. The trick they used to do this was to look at the isotopic composition of the oxygen in the wood of local trees. Water contains two isotopes of oxygen, one of which has two more neutrons than the other, making it heavier. However, when the calculation is done in detail, the amount of hydrate-derived methane needed to balance the isotopic equations is only 100 billion tonnes. Once so diluted, the material is no more of a proliferation concern than natural uranium, since isotopic enrichment is an extraordinarily difficult process. These additives might be determined by methods normally used to determine the authenticity of the juice such as isotopic methods or enzymatic methods. The charts incorporate dates derived primarily from stable isotopic systems in minerals extracted from strata with closely constrained paleontological ages. Chemical and isotopic analyses are partially complete. This was determined by examining the isotopic data from the European mammoth teeth. It is now known that density of water also depends on the isotopic ratios of the oxygen and hydrogen atoms in a particular sample. Their isotopic concentration in a natural rock sample depends greatly on the presence of these three parent uranium and thorium isotopes. It can also be extracted to a high chemical and isotopic purity from radioactive waste. The surface layers of the Sargasso Sea were used to estimate the lead isotopic concentrations. Show More Sentences Lastly is the development of differences in marine assemblages and their isotopic signatures in the Caribbean from those in the Pacific. Much of the past work on isotopic composition of iron has focused on the nucleosynthesis of 60Fe through studies of meteorites and ore formation. Integrating isotopic studies with geophysical surveys will revolutionize our understanding of the origin, history and spatial extent of the diamond-bearing lithospheric mantle beneath Canada's ancient cratons. Carbon comes in several isotopic varieties, with different weights. Using mass spectrometry, the ITU researchers can isolate minute radioactive particles and determine the isotopic composition of uranium particles. Seasonal variation of trace element and isotopic composition in the shell of a coastal mollusk, Mactra isabelleana. Based on petrographic, isotopic and fluid-inclusion thermometric data, Potter et al. Concentration of 3-hydroxybutyrate is usually determined through methods such as chromatography, isotopic measurements, and spectrophotometry. The illustrations are very useful for understanding esoteric climate data, such as isotopic records and speleothem values. The effects of sample treatment and diagenesis on the isotopic integrity of carbonate in biogenic hydroxylapatite. The sulfur isotopic signature of sulfur phases in rocks strongly suggests that the sulfur cycle involving heterotrophic bacterial reduction of sulfate was in operation 2.7 billion years ago. The materials analyzed during isotopic investigations vary from microgram quantities of highly purified mineral grains to gram-sized quantities of rock powders. Radiation dissipates over time with every isotopic half-life. This has led the CCT to recommend an improved definition of the kelvin by adding a statement about the isotopic composition of the water in triple point cells. Nd and Sr isotopic data were presented from the Archaean-Proterozoic boundary in North and East Tanzania to constrain the nature of Neoproterozoic tectonism in the Mozambique belt. As a result of this, a study is under way on the dependence on the catalyst and on the isotopic composition of the triple point of equilibrium hydrogen. Cliff and Meffan-Main's paper in the section on texturally controlled 'in situ' chronometry further highlights the importance of considering isotopic disequilibrium. This has led to the specialized field of isotopic stratigraphy. Overall, the presentday Nd isotopic compositions show an increase towards comparatively more radiogenic values from the oil shale seams to marl beds. The slightly older fossil Spongiophyton has also been interpreted as a lichen on morphological and isotopic grounds, although the isotopic basis is decidedly shaky. Show More Sentences Chemical Geology is an international journal that publishes original research papers on the isotopic and elemental geochemistry and geochronology of the Earth. The present study is focused on dolomitization processes of the Plavinas RS, providing novel data on the isotopic composition and cathodoluminescence properties. The use of a number of isotopic profiles was designed to eliminate 'noise' errors, that could have been contained within a single isotopic record. The climate and carbon cycle appears to be rather unsettled during the Silurian, which has a higher concentration of isotopic excursions than any other period. Future studies, possibly including isotopic and geochronological data, would shed more light on the evolutionary history of the metacarbonate deposit. Examples from Classical Literature Barrick and Showers contend that isotopic tests can tell warm-blooded from cold-blooded metabolisms. Because Theia came from elsewhere in the solar system, it probably had a much different isotopic fingerprint than early Earth. Find more words! 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What is the adjective for isotopic? What is the noun for isotopic? Use our Sentence Generator Nearby Words isotopes isotope isotonic solution isotonicity isotonic isotherms isotopically isotretinoin isotron isotropic isotropically isotropy 8-letter Words Starting With i is iso isot isoto isotop isotopi